Method for producing combined magnetic pole and invisible magnetic pole driven motor rotor

Abstract

The invention provides a method for producing a combined magnetic pole and invisible magnetic pole driven motor rotor, and belongs to the technical field of motors and electric appliances of electric vehicles. A permanent magnet steel is separately embedded into an oblong radial slot and an arc slot of a rotor core; the structure is a rotor magnet bypass structure, and can effectively prevent the permanent magnet steels from producing irreversible demagnetization under the action of armature reaction of impulse current and guarantee the permanent magnet steels not demagnetized; meanwhile, the magnetic field for driving the motor rotor is provided by the permanent magnet steels, so that the magnetic field intensity and the output power are high; and the motor rotor has the characteristics of high efficiency, high power density, compact structure, reliable operation and the like.

Description

technical field [0001] The invention provides a method for producing a combined magnetic pole and invisible magnetic pole driven motor rotor, which belongs to the technical field of electric vehicle motors and appliances. Background technique [0002] At present, most of the production methods of permanent magnet drive motor rotors used in electric vehicles adopt the permanent magnet external embedded structure, such as the existing technology, patent name: brushless DC motor rotor, patent number: ZL200920116549.1, discloses the following technical solutions, Including rotor core, rotating shaft and permanent magnet, the rotor core is composed of punched sheets and connected into one, the rotating shaft is fixedly connected with the rotor core, the outer surface of the rotor core is evenly distributed with an even number of T-shaped wedges, adjacent T Slots are formed between the shaped wedges, and the permanent magnets are correspondingly embedded in the slots. The permanen...

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Problems solved by technology

[0002] At present, most of the production methods of permanent magnet drive motor rotors used in electric vehicles adopt the permanent magnet external embedded structure, such as the existing technology, patent name: brushless DC motor rotor, patent number: ZL200920116549.1, discloses the following technical solutions, Including rotor core, rotating shaft and permanent magnet, the rotor core is composed of punched sheets and connected into one, the rotating shaft is fixedly connected with the rotor core, the outer surface of the rotor core is evenly distributed with an even number of T-shaped wedges, adjacent T Slots are formed between the shaped wedges, and the permanent magnets are correspondingly embedded in the slots. The permanent magnets of the rotor with this structure directly face the air gap. Under the action of the armature reaction of the impact current, irreversible demagnetization may occur. Once the permanent magnets are formed irreversible Demagnetization, the efficiency of the drive motor decreases, the power and torque drop rapidly, and its performance needs to be further improved

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